Abstract
The rovibrational states of the metastable anionic hydrogen molecule $\text{D}_{2}{}^{\ensuremath{-}}$ were studied in photofragmentation experiments at 532 nm employing a fast (keV) ion beam. By a three-dimensional fragment momentum imaging technique, the photodetachment and the dissociation of the system into neutral atoms were investigated at different times after production of the molecular ions. The present data are sensitive to both the rotational states and the vibrational wave functions of the anions and suggest that the level of rotational excitation, while still exceptionally high, is somewhat lower than estimated in recent theoretical predictions.
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